In a mine, each hour that a haul truck is not moving contributes to losses in production. Most of those unexpected halts are in the driveline, the set of components that transmits torque between the engine and the transmission to the wheels, pumps, and other components. The choice of the right driveline parts to procurement teams and maintenance managers is not just a matter of uptime but also of price.
This blog explains what mining driveline components are, where they may fail and what you must ensure before placing an order.
Driveline components are used to pass the power between the source and the place of work. The system usually includes mining equipment like rigid haul trucks, wheel loaders and dozers.
Terminology can be confusing to buyers. The driveshaft, propeller shaft and cardan shaft are often used interchangeably, although a cardan shaft is commonly a shaft with universal joints at each end. The part can be called lots of names by whom you are with, always remember to identify the part by part number and use and not name.
Mining conditions the drivelines to conditions that are uncommon to highway or light industrial use:
This is why the selection of heavy equipment spare parts must not be based on fit only, but on duty cycle and load rating as well. A component that is not overrated but is bolted on will fail prematurely and cost a lot more in downtime than it would have cost to buy.
Trivial Fact: “Dust as fine as baby powder can enter through a damaged seal in hours rather than weeks, which makes the quality of sealing more important than the material grade when it comes to mining operations.”
| Component | Role | Typical warning signs |
|---|---|---|
| Universal joint/spider bearing | Transmits torque through angle changes | Vibration, clunking on load change, rust-colored dust at the seals |
| Driveshaft tube | Carries torque between joints | Bends, cracks near welds, imbalance vibration |
| Slip yoke and splines | Absorbs shaft length changes | Worn splines, backlash, dry or corroded surfaces |
| Flange bolts | Secure the shaft to mating parts | Loose, stretched, or fretted bolts |
The first item to put on is normally the universal joint since the needle bearings of the universal joint are always under constant oscillating loads. Detection of early symptoms and, in particular, new vibration helps avoid the destruction of the driveshaft, yokes, and related parts.
Checklist to use when comparing quotes of drive components:
Did You Know: “Haul trucks’ driveshaft RPMs can be quite low relative to the RPM of an equivalent truck on the highway – but the torque is so high that they're actually designed like ship drive shafts.”
OEM parts bear the brand premium and are not necessarily fast moving. A good aftermarket drive line part has the potential to provide the same fit at a similar service life at a lower price and, in many cases, a shorter lead time. The threat is unproven quality. Prior to changing a fleet, demand dimensional drawings, seek references on similar applications, and perhaps, trial a small batch on a non-critical unit first.
Price in itself is an ineffective indicator. Compare cost per operating hour, which takes into consideration both service life and purchase price.
An effective universal joint manufacturer or supplier is more than just a shipper of parts. Look for:
Request potential suppliers to describe their process of inspection of finished joints, their seals and bearings, and the way they pack shipments. Detailed, written responses are a positive indicator; indistinct responses are a red flag.
| Factor | OEM Parts | Aftermarket Parts |
|---|---|---|
| Price | Carries a brand premium — you're paying for the badge | Typically lower cost, sometimes significantly so |
| Lead time | Can be slow-moving, especially for older equipment models | Often shorter, since more suppliers stock or produce them |
| Fit accuracy | Guaranteed match to OEM specs, no verification needed | Should match, but confirm dimensions and bolt pattern first |
| Quality consistency | Backed by brand reputation and standardized QC | Varies by supplier — ranges from excellent to unreliable |
| Material & heat treatment | Documented and traceable as standard practice | Ask for it. Don't assume it's there |
| Service life | Predictable, based on years of field data | Can match OEM life, but track record may be thin |
| Documentation | Drawings and inspection records usually included | Request them upfront — not every supplier offers this |
| Warranty support | Clear-cut, brand-backed | Check terms carefully, they differ from supplier to supplier |
| Risk level | Low. It's the safe, proven choice | Moderate until proven. Failure is a fleet-wide risk |
| Best use case | Critical units, no room for failure | Non-critical units first, then scale up once trusted |
Mining areas tend to be distant from manufacturing centers, and thus, a large number of customers bring in the spare parts from foreign manufacturers. Experience in export is important. Find a supplier that is able to manage:.
It is also good to plan in advance. Having critical spares available in store at the mine, including spider bearings, mitigates the effect of long transit time.
PTC Drivelines also sells aftermarket Caterpillar haul trucks (773, 777, 785 and 789 series) spider bearings, driveshafts and pump drive shafts. Buyers may provide an OEM part number or equip piece model, and the team can ensure the identical replacement.
Did You Know: “Correct phasing of the yoke is crucial because otherwise, you could introduce vibration to your shafts, even though they are in perfect working order.”
Breakages on mining machines are expensive, and most of them can be avoided. When buyers check part numbers, ensure dimensions and load ratings, and deal with an experienced universal joint supplier, they eliminate numerous ordering errors and frequent downtimes. You may require a single spider bearing or an entire driveshaft, but you need to find a partner who not only knows the equipment but also the logistics of exporting.
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Please give your equipment model and OEM part number to Contact PTC Drivelines to obtain a price quote on driveline parts to fit your fleet. |
Nothing significant. They both have torque; "propeller shaft" is a British-leaning word, and "driveshaft" is North American.
The vibration at speed, the clunking with the change of loads, the rust-colored dust at the seals, and the free play of the hand.
There is no definite time interval. Change them when checked to be playing, seals failing, or constant vibration.
Frequently, when the tube and yokes are straight, change the universal joints and rebalance. Bent tubes or broken welds are replacements.
Verify the OEM number and verify the cap diameter, splines, and bolt pattern with the drawing of the supplier.
Caterpillar haul trucks such as the 773, 777, 785, and 789. Enter your model and OEM part number to check coverage.
Whether you need OEM-compatible spare parts for your mining fleet, a reliable export supply partner, or want to become a regional distributor — our team is ready to help within 24 hours.
If the required part number is not listed in our product range, simply share the part number, drawing, dimensions, or technical specifications with us. Our team can review your requirement and manufacture the part to your preferred specifications.
